Day Of The Doctor showed that Rassilon didn't have support of everyone. He was running with his own agenda while teh rest of the planet burned. The War Council, for example, basically was of the mind he and his cronies could go fuck themselves.If they had a plan they believed would make them win, then yea probably, but, they're not really into an even match up. The return of the Time Lords could result in their defeat, they're scared, and would rather not go back down that road, that battle has already been won (Well, it was a stalemate, they were about to win, but, since The Daleks are back, and The Time Lords aren't, they'd like to keep the Status Quo)
I made a similar point a bit earlier. The question is if The Time Lords are to make a return to their universe then how are they going to do it with out threating to burn it down again?
Gallifrey comes back and the war isn't waiting on them, the Doctor's probably was right, they'd come in peace.
The problem is that rest of them don't believe that. What it will come down to is The Doctor convincing everyone else that his people come in peace.